OFFSET
0,2
LINKS
FORMULA
a(0)=1, a(n+1) = 3*2^(n-2)*(n+3) - 0^n/4.
Equals binomial transform of nonzero terms of A026741: (1, 1, 3, 2, 5, 3, 7, 4, ...). - Gary W. Adamson, Apr 25 2008
Equals row sums of triangle A139633. - Gary W. Adamson, Apr 27 2008
MATHEMATICA
CoefficientList[Series[(1-2x+2x^2-x^3)/(1-2x)^2, {x, 0, 50}], x] (* Harvey P. Dale, Mar 30 2011 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Jun 12 2003
STATUS
approved